Bmas kauite eld



May 10,1927. 1,628,049

E. KAUFFELD AUTOMATIC CUT-OFF 'FOR GAS BURNERS Filed Feb. 18. 1926 7I/1NVENT0R.

mad

WA ORNEY Patented May 10, 1927. 1,628,049

UNITED STATES PATENT OFFICE.

ELIAS KAUFFELD, OF PITTSBURGH, PENNSYLVANIA.

AUTOMATIC CUT-OFF FOR GAS BURNERS.

Application filed February 18, 1926. Serial No. 89,238.

ing 1 so that its inner end lies between two consecutive bonncts 2. A few of the openings 11 are close enough to the gas issuing from the bonncts to ignite it, the remainder of the bonncts being ignited from the ignited ones. (his supplied to the burner 10 from the pipe 12 connected to the pipe 5 at a point between the valve 6 and the usual main gas rali'c (3 wonircr lled by the usual thermostat ii through which the water sup ply pipe 6 panes to coils (not shown) arranged in u weil known manner above the burners The valve '3. thermostat G. and the said coils f n'ni no part of the novelty of this invention being well known. are not further iii-.1 and iiicscribe il. I

The burner i somewhat z'xeyon-ii outer i fi and is proed with it... sings ii so cl .n ioug itscntio-v ngth that gas 1: from 218 opening ignite auhimatically from ihe next ailimeiiit ignit d burner. A con :iuit U4 ion and. open at its under siiie i. one The man: bur or through the i and slightly upwa (is io a point aver the outer end of he burner outer end of the conduit l2 connuunicates with the upwardly-ta poring frustoconical conduit 13 connected by its upper end to the plate '14 having therein an oiening in which the conduit'i3 is suspends. Just above the open upper end of the conduit 13 is the metal diaphragm 15 connected by the screws 1610 the plate 14, which has the circumferential flange l? secured to the post 18 attached to the plate 19, the latter being connected to the outer face of the casing 1. The diaphragm 15 is spaced from the plate 14 by the ring 20, through which the screws 16 extend.

The lever 21 has one end pivoted to the post 18 by the pivot 22, and lies somewhat above the diaphragm 15, having connected to its central ortion the stem 23 which is connected by t e pivot 24 to the said lever. 25 is a lever pivoted between its ends to the post 18 b the in 26. One end of the lever is ivote to t e upper end of the stem 23 an the other end carries the weight 27 to counterbalance the weight which the diaphragm would otherwise have to su ort.

My invention relates to automatic cut-oils for fluid burners.

An object of this invention is to provide a cut-off for the supply of combustible fluid to a burner in case a pilot burner therefor has become extinguished. My invention is particularly adapted to what are known as instantaneous water heaters, having, large watenfllled coils automatically heated by main burners which are ignited by pilot burners upon the opening of a faucet in the water supply system to which the coils are connected. In such automatic instantaneous heaters the gas supply is cut oil' from the heater burner until a faucet draining the water supply system is opened. The pilot burner is intended to he burning all the time in such proximity to the main burner that, as soon as gas issues from the latter, it will be ignited from the pilot burner. times the pilot burner becomes unerp extinguished, so that, when the gas supplyvalve is thereafter opened, a large quantity of combustible "as escapes into the furnace chamber and hence into ihe {illElIilI or room containing the heater, whereby a dangerous explosive mixture of gas and air is formed, ready to explode when ignited by an open flame. One object of this invention is to cause the supply of gas to be cut off from the coil heating burner very soon after the pilot burner has been extinguished.

Referring to the accompanying drawing, Fig. 1 is an elevation of my invention, parts being broken away and in section; Fig. 2, a section on the line II--II on Fig. 1; and Fig. 3, an elevation of a detail in the valvetrisping mechanism.

11 the drawm 1 designates the external casing of a as eater having therein the series of close y adjacent burner tips or bon-' nets 2 connected to the common gas supply ring 3 deriving its supply from the pipe The pipe 4 receives gas from the vertical pipe 5 containing the cut-ofivalve 6 to whose stem 7 the operatin lever 8 is attached between its ends. no end of the lever is provided with the weight 9 which will move the lever anticlockwise from its full-line position, at which the valve 6 is open, to its dotted position, at which the valve 6 is closed.

An auxiliary or pilot burner 10 comprising a small metal tube 'has in its upper side a lineal series of burner openings 11, and projects through into the interior of the easeach other and bound loosely together by the band or clip 30. The upper end of the bar 29 has the downwardly-exposed shoulder 31 adapted to be engaged on its lower u together v 28 and 29 are two vertical bars Sll able on I face by the tooth 32 on the lower end of the catch or dog 33, pivoted to the bar 28 above the bar 29, the pivot 34 for the dog being arranged so that the gravity of the dog tends to urge it toward the bar 29. When the bar is lifted so as to bring the shoulder 31 above the tooth 32, the dog swings toward the bar 29 and the tooth 32 catches under the shoulder 31, whereby any down-pullon the bar 29 is transmitted to the bar 28.

The upper end of the bar 28 is pivotally suspended on one end of the horizontal lever 35 which swings on the pivot 36 on the plate 19. The remaining end of the lever 35 carries the weight 37 which tends to move the lever 35 anticlockwise and will do so upon the release of the dog 33 for the bar 29.

38 is a horizontal lever pivoted on the pin 39 located to cause the lever 38 to swing clockwise when its heavier end 43 is released from the upstanding arm 40 on the lever 35, the arm carrying an antifriction roller 41 on which the said end of the lever may rest. 42 is a handle for setting the lever 35.

A U-shaped catch or lever 44 is pivoted on the pin 45. The lower leg 46 of the catch is adapted when horizontal to engage the under face of the short or lighter end 48 of the lever 38, and thereby be prevented from rotating anticlockwise as long as this lever has its end 43 on the roller 41. The upper leg 47 of the catch 44 is adapted, when horizontal and when the lower leg is locked by the end 48 of the lever 38, to hold the lever 8 in its full-line position, by means of the chain 49 having one end attached to the unweighted end of the lever 8 and the other end held by its terminal link 50 which is slid over the leg 47. The catch has the settin handle 51.

52 1s a trip lever pivoted on the pin 36 and having its upper end in the path of the lever 38 when it falls. The other end of the lever 52 when actuated by the lever 38 moves up a ainst the pin 53 and turns the dog 33 antic ockwise so as to disengage its tooth 32 from the shoulder 31.

Assume that the main and the auxiliary burners 2 andlO are ignited and the parts are as shown in the drawing. The heat from the auxiliary burner travels up the conduits 12 and 13 and keeps the diaphragm 15 expanded or convexed upwardly slightly. When the auxiliar burner 10 is extinguished, heat ceases owing up the conduits 12 and 13 to the diaphragm, which then begins to cool and therefore contract or flatten, pulling the lever 21 downwardly. This lever through the dog 33 and the bars 28 and 29 causes the lever 35 to rock clockwise until the roller 41 is moved from beneath the end 43 of the lever 38, whereupon the lever 38 turns clockwise and removes the end 48 of the lever 38 from locking engagement with the leg 46 of the lever 44. The lever 44,

owing to its bias anticlockwise and to the up-pull of the chain 49 due to the weight 9, turns to the left and releases the chain 49, whereupon the weight 9 turns the lever 8 anticlockwise and turns the stem 7 so as to close the valve 6, thus preventing gas from reaching either burner until the described apparatus is reset as to the positions shown in the drawing. The contraction of the diaphragm causes the bar 29 to be lowered somewhat below its position assumed when the diaphragm is at its normal temperature, and the dog 33 has moved upwardly under the action of the weight 37 after the lever 38 dropped upon the triplever 52.

To reset the apparatus, the lever 44 is rotated by the handle 51 clockwise and the link 50 is slid onto the leg 47. The lever 38 is rotated anticlockwise by its handle 42 and the end 48 is brought upon the leg 46. Then the lever 35 is rotated so as to bring the arm 40 and the roller 41 beneath the end 43 of the lever 38. The lever 38 readily turns as the dog 33 is free from the shoulder 31. The tooth 32 now swings under the shoulder 31 provided the auxiliary burner 10 was ignited sufliciently early to bring the diaphragm 15 to its normal working temperature. If the diaphragm is not sufiiciently heated at this time, the tooth will swing under the shoulder as soon as the diaphragm becomes sufficiently heated. The burner 10 being ignited, it ignites the burners 2 as soon as the valve 6 was opened in the resetting operation. The cycle described will be repeated when the burner 10 becomes extinguished again.

I claim- 1. In an automatic gas cut-off, a gas-supply pipe, a cut-off valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a. thermostatic diaphragm, an auxiliary burner arranged to ignite the main burner and heat the diaphragm, and means fastened to the diaphragm and operatively connecting the intermediate portion of the diaphragm and the biasing means and controlled by the transverse distortion of the diaphragm, when heated by the auxiliary burner, so as to prevent the biasing means from closing the valve, and controlled by the reduction of said distortion, due to the cooling of the diaphragm when the auxiliary burner becomes extinguished, so as to release the biasing means, the said connecting means including a catch connecting portions of the connecting means together in combination with means for disconnecting the catch upon the release of the biasing means, the catch being biased to reconnect the said portions together when the latter are in predetermined relative positions, one of the portions being connected to the diaphragm and moved thereby. when heated, to its said predetermined position.

2. In an automatic gas cut-ofi', a gas-supply pipe, a cut-ofi valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphragm, an auxiliary burner arranged to ignite the main burner and heatthe diaphragm, a releasable catch for re-- straining the biasing means, a lever for releasably holding the catch in its restraining position, a setting device for releasably holding the lever in its catch-holding position, and means connected to the diaphragm and operable upon the cooling of the same when the auxiliary burner becomes extinguished, to cause the setting device to release the said lever, whereupon the biasing means is released to close the valve.

3. In an automatic gas cut-off, a gas-supply pipe, a cut-oil valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphragm, an auxiliary burner arranged toignite the main burner and heat the diaphragm, means operatively disconnected from the diaphragm for restraining the biasing means from closing the valve, mechanism operatively disconnected from the restraining means, and releasable means adapted to automatically connect the restraining means and the said mechanism together when the diaphragm is heated by the auxiliary burner and to release the restraining means when the diaphragm cools to a predetermined degree.

4. In an automatic gas cut-ofi', a gas-supply pipe, a cut-off valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas throu h the said pipe and valve, a thermostatic iaphragm, an auxiliary burner arranged to ignite the main burner and heat the dia hragm, means operatively disconnected rom the diaphragm for restraining the biasing means from closing the valve, mechanism operatively' disconnected from the restraining means, releasable means adapted to automatically connect the restraining means and the said mechanism together when the dia hragm is heated by the auxiliary burner an to release the restraining means when the diaphragm cools to a predetermined degree, and means releasing the releasable means upon the release of the restraining means.

5. In an automatic gas cut-oil", a gas-supply pipe, a cut-off valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, 9. thermostatic diaphragm, an auxiliary burner arranged to ignite the main burner and heat the diaphragm. and means fastened to the diaphragm and controlled by the traverse distortion of the diaphragm, when cooled to a predetermined degree after the auxiliary burner has become extinguished, for releasing the biasing means, the said controlled means including a catch connecting portions of the connecting means together in combination with means for dis connecting the catch upon the release oi. the biasing means, the catch being biased to reconnect the said portions together when the latter are in predetermined relative positions, one of the portions being connected to the diaphragm and moved thereby, when heated, to its said predetermined position.

6. In an automatic gas cut-off, a gas-supply pipe, a cut-oti valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphra m, a heat-shielding wall between the main burner and the diaphragm, an auxiliary burner arranged to ignite the main burner, and projecting through the wall toward the diaphragm, a conduit to lead heat from the auxiliary burner into contact with the diaphragm, and means controlled by the diaphragm, when cooled to a predetermined degree after the auxiliary burner has become extinguished, for releasing the biasing means.

7. In an automatic gas cut-ofi, a gas supply pipe, a cut-off valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphragm, a heat-shielding wall between the main burner and the diaphragm, an auxiliary burner arranged to i ite the main burner and projecting t rough the wall toward the diaphragm, a conduit to lead heat from the auxiliary burner into contact with the diaphragm, and means controlled by the diaphragm, when cooled to a predetermined degree after the auxiliary burner has become extinguished, for releasing the biasing means. the said auxiliary burner having a series of jets from end to end, arranged sufficiently close, one to another, for the jets to be ignited serially from one jet.

8. In an automatic gas cut-oil, a gas-supply p1pe, a cut-ofi valve therefor, means lasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphragm, an auxiliary burner arranged to ignite the main burner and heat the diaphragm, a releasable device for restraining the biasing means. and means fastened to the diaphragm and operated by the distortion of the diaphragm upon cooling for tripping the restraining means, the said operated means includin a catch connecting portions of the connecting means together in combination with means for disconnecting the catch upon the release of the biasing means, the catch being biased to reconnect the said portions together when the latter are in predetermined relative posi' tions, one of the portions being connected to the diaphragm and moved thereby, when heated, to its said predetermined position.

9. In an automatic gas cut-otf, a gas-supply pipe, 21 cut-ofi' valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphragm having a stationary periphery, an auxiliary burner arranged to ignite the main burner and distort the diaphragm by heat, and means fastened to the intermediate portion of the diaphragm and controlled by the distortion of the diaphragm, when cooled to a predetermined degree after the auxiliary burner has become extinguished, for releasing the biasing means, the said controlled means including a catch connecting portions of the connecting means together in combination with means for disconnecting the catch upon the release of the biasing means. the catch be ing biased to reconnect the said portions together when the latter are in predetermined relative positions, one of the portions being connected to the diaphragm and moved thereby, when heated, to its said predetermined position.

10. In an automatic gas cut-off, a gassupply pipe, a cut-off valve therefor, means biasing the valve when open to move to closing position, a main burner connected to receive gas through the said pipe and valve, a thermostatic diaphragm having a stationary periphery, an auxiliary burner arranged to ignite the main burner and heat the diaphragm,alever connected to the central portion of the diaphragm, a releasable means restraining the biasing means, a catch automatically connectible to the restraining means when the diaphragm ..s heated and thereafter automatically operative to cause the restraining means to be tripped when the diaphragm is cooled, and means releasing the catch upon the release of the restraining means.

Signed at Pittsburgh, Pa., this 15th day of February, 1926.

ELIAS KAUFFELD. 

